EP0579555B1 - Improved ventilation and cooling system for vehicle headlamps - Google Patents

Improved ventilation and cooling system for vehicle headlamps Download PDF

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Publication number
EP0579555B1
EP0579555B1 EP93401839A EP93401839A EP0579555B1 EP 0579555 B1 EP0579555 B1 EP 0579555B1 EP 93401839 A EP93401839 A EP 93401839A EP 93401839 A EP93401839 A EP 93401839A EP 0579555 B1 EP0579555 B1 EP 0579555B1
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EP
European Patent Office
Prior art keywords
skirt
opening
channel
lamp
headlight according
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Expired - Lifetime
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EP93401839A
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German (de)
French (fr)
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EP0579555A1 (en
Inventor
Benony Grigorescu
Marie-Catherine Nicoli
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Valeo Vision SAS
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Valeo Vision SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps

Definitions

  • the present invention relates generally to the ventilation and cooling of motor vehicle headlamps.
  • a number of projectors are already known which are equipped with a ventilation channel between the interior space of the projector and the exterior.
  • a ventilation channel must be designed to ensure a two-way air circulation between said interior space and the exterior, in order to cope with overpressures or depressions caused by changes in temperature of the projector during lighting. and successive shutdowns, ensuring that no moisture condenses on the cold walls of the projector.
  • the purpose of such a channel is at the same time to maintain the interior space of the projector, and more particularly the lamp, at a reasonable temperature intended in particular for the lamp to maintain a normal lifetime.
  • such a ventilation channel must be designed to prevent any penetration of water, mud, etc. into the interior space of the projector, especially when the vehicle is traveling in rainy conditions or when washing the engine compartment of the projector with a high pressure jet or the like.
  • a known solution to this problem consists in defining, for example by cooperation of suitable arrangements which have been molded on the rear face of the reflector and of a suitable corformation of a windscreen or closure cover which is applied against this rear face, at least one annular channel opening on the outside in its lower region and opening on the interior space of the projector in its upper region.
  • channel ventilation devices known ventilation and single cooling have the major drawback of not ensuring sufficient cooling of the lamp. It therefore works at a high temperature and its life is reduced.
  • the present invention aims mainly to overcome this drawback of the prior art, without however altering the other qualities of the known ventilation / cooling devices.
  • the present invention relates for this purpose to a motor vehicle headlamp as defined in claim 1.
  • a headlamp which comprises a lamp 10, a reflector 20 and a cover 30 intended to be applied against a rear face of the reflector.
  • a window (not shown), intended to be tightly connected to the reflector or to an intermediate piece, closes the interior space of the projector.
  • the lamp 10 is in this case a type 9006 lamp (standards of the United States of America). Other types of lamps can of course be envisaged. It comprises a base 10a intended to be applied by a shoulder 10c against an annular surface provided at the rear of the reflector, and a bulb 10b of which a filament, cooperating with a reflecting surface 20a of the reflector, is intended to generate a beam . Behind the base 10a extends a generally angled connector indicated in 10d for the electrical supply of the lamp.
  • the reflector 20 comprises, in addition to the reflecting surface 20a and a lamp hole 20b, three approximately cylindrical and coaxial skirts 22, 24, 26 which extend rearward in its posterior region. These skirts preferably share a common axis X-X which also constitutes the axis of the lamp and the optical axis of the reflector.
  • the three skirts 22, 24 and 26 came from molding during the manufacture of the reflector. To facilitate demolding, they have a section which decreases slightly from front to back (from right to left in Figure 1). However, for the sake of simplification, we will continue to speak of cylindrical skirts.
  • the outer face of the outer skirt 22 has a stepped profile which defines, together with a cover rim 30a with a smooth inner face which will be described later, three concentric annular channels 41, 42, 43.
  • This three-channel system is intended to prevent any penetration of liquid into the interior space of the projector. More specifically, the channels 43 and 42 are intended to "tire" the water capable of penetrating from the outside between the skirt 22 and the flange 30a, while the channel 41, by opening onto the outside in the lower region of the skirt 22, as illustrated, ensures the evacuation of this water.
  • the three skirts 22, 24, 26 respectively have rearward ranges which differ: the external skirt 22 extends furthest, and the internal skirt 26 extends the further away, the intermediate skirt 24 having an intermediate extension.
  • the cover 30 has the triple object of closing the interior space of the projector at the assembly level. lamp / reflector, to maintain the position of the lamp 10 and to cooperate with the rear end regions of the three skirts 22, 24, 26 to define ventilation channels as will be seen below. More specifically, the cover 30 comprises, extending from a body 31 oriented essentially radially, an outer rim 30a oriented axially forwards and capable of being in contact with the outer face of the skirt 22, an axial rib 30b intended to be in contact with the inner face of the skirt 22, and finally two ribs 30c, 30d which are in contact with the outer and inner end faces, respectively, of the intermediate skirt 24.
  • the inner face of the innermost rib 30d is planar and designed to cooperate under pressure with an O-ring seal 12 which is a part known in itself of the base 10a of the lamp.
  • the shoulder 10c of the lamp bears against the radial end face of the inner skirt 26.
  • the skirts 22, 24, 26, together with the body 31 of the cover, the collar 10c and the part of the reflector which defines the reflecting surface 20a, are capable of forming closed channels in an arc of a circle for the circulation of air and liquids, as will be seen in detail below.
  • the cover 30 includes other arrangements for holding the base 10a of the lamp, and in particular a recess 30e delimited at the rear by a re-entrant collar 30f.
  • the outer skirt 22 has in its lower part an opening 22a constituting a cold air inlet. It can be seen in FIG. 1 that this opening communicates with a bent cold air inlet passage 32, open at its two ends (respectively axially towards the front, and downwards at the rear), which is formed in the lower region of the cover 30 and defined by two walls 32a, 32b.
  • a first wall 23a connects essentially radially the skirts 22 and 24 in the upper region of the cover. This wall is extended at 25a between the skirts 24 and 26.
  • An opening 24a is formed in the skirt 24 immediately adjacent to the wall 23a-25a (to the right of the latter in FIG. 2).
  • An opening 26a is also formed in the inner skirt 26, in a position corresponding approximately to a southwest orientation in FIG. 2. This opening opens onto the interior space of the projector in the vicinity of the lamp hole 20b, immediately behind of it.
  • the skirts 22, 24, 26 provided with these arrangements, and the cover 30, together define a first labyrinth communication path between the exterior and the interior space of the projector, this path or channel being defined by a first channel part in an arc of a circle C1 delimited by the skirts 22 and 24 and extending in this case over a little less than 180 ° between the openings 22a and 24a, and by a second portion of channel in an arc of a circle C2 delimited by the skirts 24 and 26, running along the channel C1 and extending in this case over a little less than 135 ° between the openings 24a and 26a.
  • the path defined by the channel parts C1 and C2 and the associated openings essentially constitutes a fresh air intake path, relatively large section, for cooling the projector and in particular the lamp.
  • Another opening 26b is formed in the skirt 26, immediately adjacent to the wall 25a (to the left of the latter in FIG. 2).
  • the skirt 24 further defines an opening 24c which is positioned with a slight offset (to the left relative to the opening 26b) relative to the opening 26b, so as to define a first part of the winding path.
  • a channel portion C3 is defined between the skirts 22 and 24, from the opening 24c and up to an opening 31a formed in the body 31 of the cover 30 and positioned so as to open into a recess 22d of the skirt 22
  • This opening 31a communicates with a chimney (schematically indicated at 31b) which preferably extends upwards and which is formed in a corresponding location in the cover 30.
  • the channel part C3 also defines a sinuous path using a plurality of protuberances molded from the skirts 22 and 24. More specifically, a low wall 24d projects upwards from the intermediate skirt 24, on a substantial part of the height of the channel part C3, immediately adjacent to the opening 24c (to the left of the latter in FIG. 2). A rib 22b extends downwards in the channel part C3, downstream of the wall 24d. Then, a springboard-shaped part 24e projects upwards, downstream of the rib 22b, from the intermediate skirt 24. Finally, another low wall 22c partially seals the channel part C3 from the external skirt 22 , immediately upstream of the recess 22d.
  • the part of channel C3 extends into a part of channel C4, always defined between the skirts. 22 and 24, up to the lower opening 22a.
  • a low wall 24b projects downwards from the intermediate skirt 24, to locally decrease the section of said part C4 for the purposes explained below.
  • annular end edge of the outer skirt 22 includes a plurality of protruding pins 221 intended essentially to ensure that the cover 30 is tightened on the skirt 22 without any other fixing means, the cover 30 being provided with recesses which are essentially complementary to these pions. These pins serve incidentally as polarizing means during assembly of the cover.
  • the air heated by the lamp in the interior space of the projector is evacuated through the path 26b, 24c, C3, 22d and 31a.
  • This double circulation of hot air and cold air along two separate paths advantageously makes it possible to obtain a large flow of fresh air, capable of maintaining the interior space of the projector, and in particular the lamp, at an operating temperature. relatively low, which extends its lifespan.
  • the design of the two paths is such that any penetration of water or dirt (mud, etc.) into the interior space is avoided.
  • the passage 32 is designed to protect the opening 22a against direct jets of liquid, while the initial part (C1) of this path, as well as the passage 26a, create rising flow directions.
  • the arrangements formed in the channel part C3 are intended to "tire" the water contained in the form of vapor in the outgoing hot air flow, this water being deposited on the walls of said channel part and then evacuated by gravity, via channel part C4, to the opening 22a.
  • This opening therefore takes the place of both the fresh air inlet opening and the water outlet opening.
  • the wall for 24b has the purpose of authorizing this evacuation of water or other liquid while suitably isolating the fresh air inlet channel from the hot air outlet channel, by an appropriate local reduction of the section of the channel part C4.
  • the lower wall 24b together with the protrusions 22c and 22b located in the upper region, are intended to laminate any reverse air flow charged with water or moisture, capable of circulating in the parts of channels C4 and C3, dropping the water by gravity.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Description

La présente invention a trait d'une façon générale à la ventilation et au refroidissement des projecteurs de véhicules automobiles.The present invention relates generally to the ventilation and cooling of motor vehicle headlamps.

On connaît déjà un certain nombre de projecteurs équipés d'un canal de ventilation entre l'espace intérieur du projecteur et l'extérieur. Classiquement, un tel canal de ventilation doit être conçu pour assurer une circulation d'air dans les deux sens entre ledit espace intérieur et l'extérieur, afin de faire face aux surpressions ou dépressions provoquées par les changements de température du projecteur lors d'allumages et extinctions successifs, en assurant qu'aucune humidité ne viennent se condenser sur les parois froides du projecteur. Un tel canal a dans le même temps pour objet de maintenir l'espace intérieur du projecteur, et plus particulièrement la lampe, à une température raisonnable destinée en particulier à ce que la lampe conserve une durée de vie normale.A number of projectors are already known which are equipped with a ventilation channel between the interior space of the projector and the exterior. Conventionally, such a ventilation channel must be designed to ensure a two-way air circulation between said interior space and the exterior, in order to cope with overpressures or depressions caused by changes in temperature of the projector during lighting. and successive shutdowns, ensuring that no moisture condenses on the cold walls of the projector. The purpose of such a channel is at the same time to maintain the interior space of the projector, and more particularly the lamp, at a reasonable temperature intended in particular for the lamp to maintain a normal lifetime.

Dans le même temps, un tel canal de ventilation doit être conçu pour éviter toute pénétration d'eau, de boue, etc... dans l'espace intérieur du projecteur notamment lors de la circulation du véhicule dans des conditions de pluie ou lors du lavage du compartiment moteur du projecteur avec un jet à haute pression ou analogue.At the same time, such a ventilation channel must be designed to prevent any penetration of water, mud, etc. into the interior space of the projector, especially when the vehicle is traveling in rainy conditions or when washing the engine compartment of the projector with a high pressure jet or the like.

Une solution connue à ce problème consiste à définir, par exemple par coopération d'aménagements appropriés venues de moulage sur la face arrière du réflecteur et d'une corformation adaptée d'une bonnette ou couvercle de fermeture venant s'appliquer contre cette face arrière, au moins un canal annulaire débouchant sur l'extérieur dans sa région inférieure et débouchant sur l'espace intérieur du projecteur dans sa région supérieure.A known solution to this problem consists in defining, for example by cooperation of suitable arrangements which have been molded on the rear face of the reflector and of a suitable corformation of a windscreen or closure cover which is applied against this rear face, at least one annular channel opening on the outside in its lower region and opening on the interior space of the projector in its upper region.

Le document FR-A-2 600 145 au nom de la Demanderesse décrit un projecteur de ce type.Document FR-A-2 600 145 in the name of the Applicant describes a projector of this type.

Cependant, les dispositifs de ventilation à canal de ventilation et de refroidissement unique connus présentent l'inconvénient majeur de ne pas assurer un refroidissement suffisant de la lampe. Celle-ci travaille donc à une température élevée et sa durée de vie en est réduite.However, channel ventilation devices known ventilation and single cooling have the major drawback of not ensuring sufficient cooling of the lamp. It therefore works at a high temperature and its life is reduced.

La présente invention vise principalement à pallier cet inconvénient de la technique antérieure, sans toutefois altérer les autres qualités des dispositifs de ventilation/refroidissement connus.The present invention aims mainly to overcome this drawback of the prior art, without however altering the other qualities of the known ventilation / cooling devices.

La présente invention concerne à cet effet un projecteur de véhicule automobile tel que défini dans la revendication 1.The present invention relates for this purpose to a motor vehicle headlamp as defined in claim 1.

Des aspects préférés, mais non limitatifs de ce projecteur sont définis dans les sous-revendications.Preferred, but not limiting, aspects of this projector are defined in the subclaims.

D'autres aspects, buts et avantages de la présente invention apparaîtront mieux à la lecture de la description détaillée suivante d'un mode de réalisation préféré de celle-ci, donnée à titre d'exemple et faite en référence au dessin annexé, sur lequel:

  • la figure 1 est une vue en coupe verticale axiale d'une partie d'un projecteur équipé de moyens de ventilation selon l'invention, et
  • la figure 2 est une vue en coupe verticale transversale selon la ligne II-II de la figure 1.
Other aspects, objects and advantages of the present invention will appear better on reading the following detailed description of a preferred embodiment thereof, given by way of example and made with reference to the appended drawing, in which :
  • FIG. 1 is a view in axial vertical section of part of a projector fitted with ventilation means according to the invention, and
  • FIG. 2 is a view in transverse vertical section along the line II-II of FIG. 1.

En référence au dessin, on a représenté en partie un projecteur qui comporte une lampe 10, un réflecteur 20 et un couvercle 30 destiné à être appliqué contre une face arrière du réflecteur. Une glace (non représentée), destinée à être reliée de façon étanche au réflecteur ou à une pièce intermédiaire, ferme l'espace intérieur du projecteur.Referring to the drawing, there is shown in part a headlamp which comprises a lamp 10, a reflector 20 and a cover 30 intended to be applied against a rear face of the reflector. A window (not shown), intended to be tightly connected to the reflector or to an intermediate piece, closes the interior space of the projector.

La lampe 10 est en l'espèce une lampe de type 9006 (normes des Etats-Unis d'Amérique). D'autres types de lampes peuvent bien entendu être envisagés. Elle comporte une base 10a destinée à venir s'appliquer par un épaulement 10c contre une surface annulaire prévue à l'arrière du réflecteur, et un bulbe l0b dont un filament, coopérant avec une surface réfléchissante 20a du réflecteur, est destiné à engendrer un faisceau. En arrière de la base 10a s'étend un connecteur coudé globalement indiqué en 10d pour l'alimentation électrique de la lampe.The lamp 10 is in this case a type 9006 lamp (standards of the United States of America). Other types of lamps can of course be envisaged. It comprises a base 10a intended to be applied by a shoulder 10c against an annular surface provided at the rear of the reflector, and a bulb 10b of which a filament, cooperating with a reflecting surface 20a of the reflector, is intended to generate a beam . Behind the base 10a extends a generally angled connector indicated in 10d for the electrical supply of the lamp.

Le réflecteur 20 comporte, outre la surface réfléchissante 20a et un trou de lampe 20b, trois jupes approximativement cylindriques et coaxiales 22, 24, 26 qui s'étendent vers l'arrière dans sa région postérieure. Ces jupes partagent de préférence un axe commun X-X qui constitue également l'axe de la lampe et l'axe optique du réflecteur.The reflector 20 comprises, in addition to the reflecting surface 20a and a lamp hole 20b, three approximately cylindrical and coaxial skirts 22, 24, 26 which extend rearward in its posterior region. These skirts preferably share a common axis X-X which also constitutes the axis of the lamp and the optical axis of the reflector.

De préférence, les trois jupes 22, 24 et 26 sont venues de moulage lors de la fabrication du réflecteur. Pour faciliter le démoulage, elles présentent une section qui diminue légèrement de l'avant vers l'arrière (de la droite vers la gauche sur la figure 1). On continuera cependant, par souci de simplification, à parler de jupes cylindriques.Preferably, the three skirts 22, 24 and 26 came from molding during the manufacture of the reflector. To facilitate demolding, they have a section which decreases slightly from front to back (from right to left in Figure 1). However, for the sake of simplification, we will continue to speak of cylindrical skirts.

On observe en outre sur la figure 1 que la face extérieure de la jupe extérieure 22 présente un profil en gradin qui définit, conjointement avec un rebord de couvercle 30a à face intérieure lisse qui sera décrit plus loin, trois canaux annulaires concentriques 41, 42, 43. Ce système de trois canaux est destiné à éviter toute pénétration de liquide dans l'espace intérieur du projecteur. Plus précisément, les canaux 43 et 42 ont pour objet de "fatiguer" l'eau susceptible de pénétrer depuis l'extérieur entre la jupe 22 et le rebord 30a, tandis que le canal 41, en débouchant sur l'extérieur dans la région inférieure de la jupe 22, comme illustré, permet d'assurer l'évacuation ce cette eau.It can also be seen in FIG. 1 that the outer face of the outer skirt 22 has a stepped profile which defines, together with a cover rim 30a with a smooth inner face which will be described later, three concentric annular channels 41, 42, 43. This three-channel system is intended to prevent any penetration of liquid into the interior space of the projector. More specifically, the channels 43 and 42 are intended to "tire" the water capable of penetrating from the outside between the skirt 22 and the flange 30a, while the channel 41, by opening onto the outside in the lower region of the skirt 22, as illustrated, ensures the evacuation of this water.

Comme on l'observe également sur la figure 1, les trois jupes 22, 24, 26 présentent respectivement des étendues vers l'arrière qui diffèrent : la jupe extérieure 22 s'étend le plus loin, et la jupe intérieure 26 s'étend le moins loin, la jupe intermédiaire 24 ayant une extension intermédiaire.As can also be seen in FIG. 1, the three skirts 22, 24, 26 respectively have rearward ranges which differ: the external skirt 22 extends furthest, and the internal skirt 26 extends the further away, the intermediate skirt 24 having an intermediate extension.

Le couvercle 30 a pour triple objet de fermer l'espace intérieur du projecteur au niveau de l'assemblage lampe/réflecteur, d'assurer le maintien en position de la lampe 10 et de coopérer avec les régions terminales arrière des trois jupes 22, 24, 26 pour définir des canaux de ventilation comme on va le voir plus loin. Plus précisément, le couvercle 30 comporte, s'étendant à partir d'un corps 31 orienté essentiellement radialement, un rebord extérieur 30a orienté axialement vers l'avant et apte à être en contact avec la face extérieure de la jupe 22, une nervure axiale 30b destinée à être en contact avec la face intérieure de la jupe 22, et enfin deux nervures 30c, 30d qui sont au contact des faces terminales extérieure et intérieure, respectivement, de la jupe intermédiaire 24.The cover 30 has the triple object of closing the interior space of the projector at the assembly level. lamp / reflector, to maintain the position of the lamp 10 and to cooperate with the rear end regions of the three skirts 22, 24, 26 to define ventilation channels as will be seen below. More specifically, the cover 30 comprises, extending from a body 31 oriented essentially radially, an outer rim 30a oriented axially forwards and capable of being in contact with the outer face of the skirt 22, an axial rib 30b intended to be in contact with the inner face of the skirt 22, and finally two ribs 30c, 30d which are in contact with the outer and inner end faces, respectively, of the intermediate skirt 24.

Le rebord 30a et les nervures 30b-d, en enserrant les régions terminales des jupes 22, 24, assurent la fixation ferme et étanche du couvercle 30 sur l'arrière du réflecteur.The rim 30a and the ribs 30b-d, by enclosing the end regions of the skirts 22, 24, ensure the firm and tight fixing of the cover 30 on the rear of the reflector.

La face intérieure de la nervure 30d la plus à l'intérieur est plane et conçue pour coopérer en pression avec un joint torique d'étanchéité 12 qui fait partie de façon connue en soi de la base 10a de la lampe. L'épaulement 10c de la lampe est en appui contre la face radiale terminale de la jupe intérieure 26.The inner face of the innermost rib 30d is planar and designed to cooperate under pressure with an O-ring seal 12 which is a part known in itself of the base 10a of the lamp. The shoulder 10c of the lamp bears against the radial end face of the inner skirt 26.

Les jupes 22, 24, 26, conjointement avec le corps 31 du couvercle, la collerette 10c et la partie du réflecteur qui définit la surface réfléchissante 20a, sont aptes à former des canaux fermés en arc de cercle pour la circulation de l'air et des liquides, comme on le verra en détail plus loin.The skirts 22, 24, 26, together with the body 31 of the cover, the collar 10c and the part of the reflector which defines the reflecting surface 20a, are capable of forming closed channels in an arc of a circle for the circulation of air and liquids, as will be seen in detail below.

Le couvercle 30 comporte d'autres aménagements pour le maintien de la base 10a de la lampe, et en particulier un évidement 30e délimité à l'arrière par une collerette rentrante 30f.The cover 30 includes other arrangements for holding the base 10a of the lamp, and in particular a recess 30e delimited at the rear by a re-entrant collar 30f.

On va maintenant décrire en référence à la figure 2 des aménagements prévus sur et dans les jupes 22, 24, 26 pour assurer la ventilation et le refroidissement de l'espace intérieur du projecteur, et tout particulièrement de la lampe 10.We will now describe with reference to Figure 2 of the arrangements provided on and in the skirts 22, 24, 26 to ensure ventilation and cooling of the interior space of the projector, and in particular of the lamp 10.

La jupe extérieure 22 comporte dans sa partie inférieure une ouverture 22a constituant une entrée d'air froid. On observe sur la figure 1 que cette ouverture communique avec un passage d'entrée d'air froid coudé 32, ouvert à ses deux extrémités (respectivement axialement vers l'avant, et vers le bas à l'arrière), qui est ménagé dans la région inférieure du couvercle 30 et défini par deux parois 32a, 32b.The outer skirt 22 has in its lower part an opening 22a constituting a cold air inlet. It can be seen in FIG. 1 that this opening communicates with a bent cold air inlet passage 32, open at its two ends (respectively axially towards the front, and downwards at the rear), which is formed in the lower region of the cover 30 and defined by two walls 32a, 32b.

Un premier muret 23a relie essentiellement radialement les jupes 22 et 24 dans la région supérieure du couvercle. Ce muret est prolongé en 25a entre les jupes 24 et 26. Une ouverture 24a est ménagée dans la jupe 24 de façon immédiatement adjacente au muret 23a-25a (à droite de celui-ci sur la figure 2). Une ouverture 26a est par ailleurs formée dans la jupe intérieure 26, dans une position correspondant approximativement à une orientation sud-ouest sur la figure 2. Cette ouverture débouche sur l'espace intérieur du projecteur au voisinage du trou de lampe 20b, immédiatement en arrière de celui-ci.A first wall 23a connects essentially radially the skirts 22 and 24 in the upper region of the cover. This wall is extended at 25a between the skirts 24 and 26. An opening 24a is formed in the skirt 24 immediately adjacent to the wall 23a-25a (to the right of the latter in FIG. 2). An opening 26a is also formed in the inner skirt 26, in a position corresponding approximately to a southwest orientation in FIG. 2. This opening opens onto the interior space of the projector in the vicinity of the lamp hole 20b, immediately behind of it.

Les jupes 22, 24, 26 pourvues de ces aménagements, et le couvercle 30, définissent ensemble un premier trajet de communication en labyrinthe entre l'extérieur et l'espace intérieur du projecteur, ce trajet ou canal étant défini par une première partie de canal en arc de cercle C1 délimitée par les jupes 22 et 24 et s'étendant en l'espèce sur un peu moins de 180° entre les ouvertures 22a et 24a, et par une seconde partie de canal en arc de cercle C2 délimitée les jupes 24 et 26, longeant le canal C1 et s'étendant en l'espèce sur un peu moins de 135° entre les ouvertures 24a et 26a.The skirts 22, 24, 26 provided with these arrangements, and the cover 30, together define a first labyrinth communication path between the exterior and the interior space of the projector, this path or channel being defined by a first channel part in an arc of a circle C1 delimited by the skirts 22 and 24 and extending in this case over a little less than 180 ° between the openings 22a and 24a, and by a second portion of channel in an arc of a circle C2 delimited by the skirts 24 and 26, running along the channel C1 and extending in this case over a little less than 135 ° between the openings 24a and 26a.

Le trajet défini par les parties de canal C1 et C2 et les ouvertures associées constitue pour l'essentiel un trajet d'entrée d'air frais, à section relativement importante, pour le refroidissement du projecteur et en particulier de la lampe.The path defined by the channel parts C1 and C2 and the associated openings essentially constitutes a fresh air intake path, relatively large section, for cooling the projector and in particular the lamp.

Une autre ouverture 26b est ménagée dans la jupe 26, de façon immédiatement adjacente au muret 25a (à gauche de celui-ci sur la figure 2). La jupe 24 définit en outre une ouverture 24c qui est positionnée avec un léger décalage (vers la gauche par rapport à l'ouverture 26b) par rapport à l'ouverture 26b, de façon à définir une première partie de trajet sineuse.Another opening 26b is formed in the skirt 26, immediately adjacent to the wall 25a (to the left of the latter in FIG. 2). The skirt 24 further defines an opening 24c which is positioned with a slight offset (to the left relative to the opening 26b) relative to the opening 26b, so as to define a first part of the winding path.

Une partie de canal C3 est définie entre les jupes 22 et 24, à partir de l'ouverture 24c et jusqu'à une ouverture 31a formée dans le corps 31 du couvercle 30 et positionnée de manière à déboucher dans un renfoncement 22d de la jupe 22. Cette ouverture 31a communique avec une cheminée (schématiquement indiquée en 31b) qui s'étend de préférence vers le haut et qui est formée dans un emplacement correspondant du couvercle 30.A channel portion C3 is defined between the skirts 22 and 24, from the opening 24c and up to an opening 31a formed in the body 31 of the cover 30 and positioned so as to open into a recess 22d of the skirt 22 This opening 31a communicates with a chimney (schematically indicated at 31b) which preferably extends upwards and which is formed in a corresponding location in the cover 30.

La partie de canal C3 définit également un trajet sinueux à l'aide d'une pluralité de protubérances venues de moulage sur les jupes 22 et 24. Plus précisément, un muret 24d fait saillie vers le haut à partir de la jupe intermédiaire 24, sur une partie substantielle de la hauteur de la partie de canal C3, de façon immédiatement adjacente à l'ouverture 24c (à gauche de celle-ci sur la figure 2). Une nervure 22b s'étend vers le bas dans la partie de canal C3, en aval du muret 24d. Ensuite, une partie en forme de tremplin 24e fait saillie vers le haut, en aval de la nervure 22b, à partir de la jupe intermédiaire 24. Enfin, un autre muret 22c obture partiellement la partie de canal C3 à partir de la jupe extérieure 22, immédiatement en amont du renfoncement 22d.The channel part C3 also defines a sinuous path using a plurality of protuberances molded from the skirts 22 and 24. More specifically, a low wall 24d projects upwards from the intermediate skirt 24, on a substantial part of the height of the channel part C3, immediately adjacent to the opening 24c (to the left of the latter in FIG. 2). A rib 22b extends downwards in the channel part C3, downstream of the wall 24d. Then, a springboard-shaped part 24e projects upwards, downstream of the rib 22b, from the intermediate skirt 24. Finally, another low wall 22c partially seals the channel part C3 from the external skirt 22 , immediately upstream of the recess 22d.

On observe pour terminer qu'au delà du départ 31a vers la cheminée 31b, la partie de canal C3 se prolonge en une partie de canal C4, toujours définie entre les jupes 22 et 24, jusqu'à l'ouverture inférieure 22a. Dans la partie C4, immédiatement en amont de l'ouverture 22a, un muret pendant 24b fait saillie vers le bas à partir de la jupe intermédiaire 24, pour diminuer localement la section de ladite partie C4 à des fins expliquées plus loin.Finally, we observe that beyond the start 31a towards the chimney 31b, the part of channel C3 extends into a part of channel C4, always defined between the skirts. 22 and 24, up to the lower opening 22a. In the part C4, immediately upstream of the opening 22a, a low wall 24b projects downwards from the intermediate skirt 24, to locally decrease the section of said part C4 for the purposes explained below.

On notera enfin que le bord terminal annulaire de la jupe extérieure 22 comporte une pluralité de pions saillants 221 destinés essentiellement à assurer un serrage du couvercle 30 sur la jupe 22 sans autre moyen de fixation, le couvercle 30 étant pourvu de renfoncements essentiellement complémentaires de ces pions. Ces pions servent accessoirement de moyens de détrompage lors du montage du couvercle.Finally, it will be noted that the annular end edge of the outer skirt 22 includes a plurality of protruding pins 221 intended essentially to ensure that the cover 30 is tightened on the skirt 22 without any other fixing means, the cover 30 being provided with recesses which are essentially complementary to these pions. These pins serve incidentally as polarizing means during assembly of the cover.

Le comportement du projecteur tel que décrit ci-dessus va maintenant être expliqué.The behavior of the projector as described above will now be explained.

L'air échauffé par la lampe dans l'espace intérieur du projecteur s'évacue à travers le trajet 26b, 24c, C3, 22d et 31a.The air heated by the lamp in the interior space of the projector is evacuated through the path 26b, 24c, C3, 22d and 31a.

De l'air plus froid provenant de l'extérieur est en même temps introduit dans l'espace intérieur via le trajet 32, 22a, C1, 24a, C2 et 26a.Colder air from the outside is simultaneously introduced into the interior space via path 32, 22a, C1, 24a, C2 and 26a.

Cette double circulation d'air chaud et d'air froid selon deux trajets distincts permet avantageusement d'obtenir un débit d'air frais important, capable de maintenir l'espace intérieur du projecteur, et en particulier la lampe, à une température de fonctionnement relativement basse, ce qui prolonge sa durée de vie.This double circulation of hot air and cold air along two separate paths advantageously makes it possible to obtain a large flow of fresh air, capable of maintaining the interior space of the projector, and in particular the lamp, at an operating temperature. relatively low, which extends its lifespan.

En outre, la conception des deux trajets est telle que l'on évite toute pénétration d'eau ou de salissures (boue,...) dans l'espace intérieur. Plus précisément, au niveau du trajet d'entrée d'air froid, le passage 32 est conçu pour protéger l'ouverture 22a contre les jets directs de liquide, tandis que la partie initiale (C1) de ce trajet, de même que le passage 26a, créent des directions de flux montantes.In addition, the design of the two paths is such that any penetration of water or dirt (mud, etc.) into the interior space is avoided. More specifically, at the cold air inlet path, the passage 32 is designed to protect the opening 22a against direct jets of liquid, while the initial part (C1) of this path, as well as the passage 26a, create rising flow directions.

Au niveau du trajet de sortie d'air chaud, les aménagements formés dans la partie de canal C3 ont pour objet de "fatiguer" l'eau contenue sous forme de vapeur dans le flux d'air chaud sortant, cette eau se déposant sur les parois de ladite partie de canal pour ensuite s'évacuer par gravité, via la partie de canal C4, jusqu'à l'ouverture 22a. Cette ouverture tient donc lieu à la fois d'ouverture d'entrée d'air frais et d'ouverture d'évacuation de l'eau. On observera en outre que le muret pendant 24b a pour objet d'autoriser cette évacuation d'eau ou autre liquide tout en isolant convenablement le canal d'entrée d'air frais du canal de sortie d'air chaud, par une diminution locale appropriée de la section de la partie de canal C4.At the level of the hot air outlet path, the arrangements formed in the channel part C3 are intended to "tire" the water contained in the form of vapor in the outgoing hot air flow, this water being deposited on the walls of said channel part and then evacuated by gravity, via channel part C4, to the opening 22a. This opening therefore takes the place of both the fresh air inlet opening and the water outlet opening. It will further be observed that the wall for 24b has the purpose of authorizing this evacuation of water or other liquid while suitably isolating the fresh air inlet channel from the hot air outlet channel, by an appropriate local reduction of the section of the channel part C4.

En outre, le muret inférieur 24b, conjointement avec les parties saillantes 22c et 22b situées dans la région supérieure, ont pour objet de laminer tout flux d'air inverse chargé en eau ou en humidité, susceptible de circuler dans les parties de canaux C4 et C3, en faisant retomber l'eau par gravité.In addition, the lower wall 24b, together with the protrusions 22c and 22b located in the upper region, are intended to laminate any reverse air flow charged with water or moisture, capable of circulating in the parts of channels C4 and C3, dropping the water by gravity.

Bien entendu, la protection vis-à-vis des projections d'eau est également assurée par la coopération étanche du couvercle 30 avec les régions terminales des jupes 22, 24 et 26, ainsi que par la coopération étanche, à l'aide du joint torique 12, entre la base 10a de la lampe et le couvercle 30.Of course, protection against splashing water is also ensured by the tight cooperation of the cover 30 with the terminal regions of the skirts 22, 24 and 26, as well as by the tight cooperation, using the seal. toric 12, between the base 10a of the lamp and the cover 30.

On observera en outre que, par simple mise en place axiale, automatisable, du couvercle 30 sur l'arrière du réflecteur, on assure simultanément la constitution du système de ventilation et de refroidissement tel qu'il a été défini ci-dessus, avec protection contre les projections de liquides et évacuation de tout liquide susceptible d'y avoir pénétré, et la fixation de la lampe 10 sur le réflecteur.It will further be observed that, by simple axial positioning, which can be automated, of the cover 30 on the rear of the reflector, the ventilation and cooling system as defined above is simultaneously ensured, with protection against splashing liquids and evacuation of any liquid likely to have penetrated therein, and fixing the lamp 10 to the reflector.

On notera enfin que les fonctions de ventilation et de refroidissement sont réalisées sans avoir à ménager la moindre ouverture au niveau de la surface réfléchissante 20a du réflecteur 20, puisque l'air entrant et l'air sortant passent tous deux par le trou de lampe 20b. A cet égard, on observera qu'en retirant simplement la lampe 10, il est possible, par simple application étanché d'un embout approprié sur le trou de lampe, de vérifier la bonne étanchéité du projecteur entre le réflecteur (ou une pièce intermédiaire adéquate) et la glace.Finally, note that the ventilation functions and cooling are carried out without having to spare the slightest opening at the reflective surface 20a of the reflector 20, since the incoming air and the outgoing air both pass through the lamp hole 20b. In this regard, it will be observed that by simply removing the lamp 10, it is possible, by simple sealed application of an appropriate tip on the lamp hole, to check the good sealing of the projector between the reflector (or an adequate intermediate part ) and ice.

Claims (11)

  1. A motor vehicle headlight of the type comprising a lamp (10), a reflector (20), a cover (30) pressed against the rear of the headlight, and a closure glass, together with cooling and ventilation means for the inside space of the headlight as defined at least by the reflector, the headlight being characterized in that the cooling and ventilation means comprise:
    an air inlet first channel (32, 22a, C1, 24a, C2, 26a) extending via at least one angle between a first opening to the outside (32, 22a) that opens out essentially downwards, and a region of said inside space situated beneath the lamp; and
    an air outlet second channel (26b, 24c, C3) extending along a sinuous path between a region of the inside space situated above the lamp and a second opening to the outside (31a, 31b) distinct from the first.
  2. A headlight according to claim 1, characterized in that the second opening (31a) communicates with the first opening (32, 22a) via a liquid removal channel (C4) that extends generally downwards.
  3. A headlight according to claim 1 or 2, characterized in that the channels are defined at least in part by three essentially coaxial skirts (22, 24, 26) extending rearwards from a rear region of the reflector (20), and by said cover (30) which is pressed against and clamped to said skirts.
  4. A headlight according to claim 3, characterized in that the cover (30) forms at least a portion of the means (30e) for fixing the lamp (10).
  5. A headlight according to claim 4, characterized in that the lamp (10) includes a base (10a) having a collar (10c) that presses against an end face of the inner skirt (26), the channels thus being defined in part by the lamp.
  6. A headlight according to any one of claims 3 to 5, characterized in that the first channel is defined by a first channel portion (C1) extending between said first opening that opens to the outside (22a) and formed in a lower region of the outer skirt (22) and an opening (24a) formed in an upper region of the intermediate skirt (24), and by a second channel portion (C2) extending between said opening (24a) formed in an upper region of the intermediate skirt (24) and an opening formed in a lower region of the inner skirt (26).
  7. A headlight according to claim 6, characterized in that a web (23a, 25a) connects the outer skirt to the intermediate skirt, and the intermediate skirt to the inner skirt, in the vicinity of said opening (24a) formed in the intermediate skirt.
  8. A headlight according to claim 7, characterized in that the second channel is defined through an opening (26d) formed in the inner skirt (26) on the side of the web (23a, 25a) that is opposite to said opening (24a) formed in the intermediate skirt, an opening (24c) formed in the intermediate skirt on the same side of the web but out of alignment with the opening (26b) formed in the inner skirt, by a channel portion (C3) extending generally downwards between the intermediate skirt and the outer skirt, and by a chimney (31b) putting said channel portion into communication with the outside in a generally upward direction.
  9. A headlight according to claim 8, characterized in that said channel portion (C3) includes baffle-forming means defined by portions (24d, 22b, 24e, 22c) projecting into said channel portion from the outer skirt (22) and from the intermediate skirt (24).
  10. A headlight according to claim 8 or 9, itself as dependent on claim 2, characterized in that said channel portion (C3) extends downwards beyond the chimney between said outer skirt (22) and said intermediate skirt (24) as far as said opening (22a) formed in the lower region of the outer skirt, thereby defining said liquid-removal channel (C4).
  11. A headlight according to claim 10, characterized in that a web (24b) is provided in said liquid removal channel (C4) between said chimney and said opening (22a) formed in the lower region of the outer skirt, the web (24b) extending generally downwards from the intermediate skirt and partially closing said channel.
EP93401839A 1992-07-17 1993-07-16 Improved ventilation and cooling system for vehicle headlamps Expired - Lifetime EP0579555B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9208836A FR2693787B1 (en) 1992-07-17 1992-07-17 Motor vehicle headlight fitted with advanced ventilation and cooling means.
FR9208836 1992-07-17

Publications (2)

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EP0579555A1 EP0579555A1 (en) 1994-01-19
EP0579555B1 true EP0579555B1 (en) 1996-09-18

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EP93401839A Expired - Lifetime EP0579555B1 (en) 1992-07-17 1993-07-16 Improved ventilation and cooling system for vehicle headlamps

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US (1) US5457616A (en)
EP (1) EP0579555B1 (en)
JP (1) JP3284380B2 (en)
BR (1) BR9302848A (en)
DE (1) DE69304829T2 (en)
ES (1) ES2094506T3 (en)
FR (1) FR2693787B1 (en)

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Also Published As

Publication number Publication date
JPH06187807A (en) 1994-07-08
DE69304829T2 (en) 1997-03-13
BR9302848A (en) 1994-02-22
JP3284380B2 (en) 2002-05-20
US5457616A (en) 1995-10-10
DE69304829D1 (en) 1996-10-24
ES2094506T3 (en) 1997-01-16
EP0579555A1 (en) 1994-01-19
FR2693787B1 (en) 1994-10-21
FR2693787A1 (en) 1994-01-21

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